Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
?
EE Times-Asia > Power/Alternative Energy
?
?
Power/Alternative Energy??

Resistors double power ratings

Posted: 25 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:irc? wirewound resistor? sp20 series? resistor? sp20?

Providing design engineers with cost-effective resistors for power circuits where board space is at a premium, resistor manufacturer IRC now offers economical wirewound devices that are rated at double the power dissipation of traditional axial-leaded packages. Designated the SP/SPP series, these power wirewound resistors are also available in fusible and flame-resistant versions.

Applications for the SP/SPP series resistors include power supplies, motor controllers, televisions, consumer electronic products and appliances, as well as general-purpose power circuits. The resistors can also be used as drop-in replacements for carbon composition devices in certain applications.

The SP20 series resistors are rated for 1W at 50C, with resistance values from 0.1? to 1,200?, in standard tolerances of 5 percent and 10 percent, with temperature coefficient of resistance (TCR) ratings as low as 150ppm/C. The SPH series resistors are rated for 2W at 70C, with resistance values from 0.1? to 2,400?, in standard tolerances of 5 percent and 10 percent, with TCRs as low as 150ppm/C.

The SP20 Series resistors are rated for 1W in a package typically associated with half-watt devices, while the SPH is rated for 2W in a one-watt package. "This kind of power density in a low-cost resistor gives design engineers increased flexibility in their power electronics circuits by enabling them to specify a smaller device that can meet their power and surge requirements," said Keith Chipman, product manager for IRC's Wirewound and Film Technologies Division, in a statement.

The SP20/SP20F and SPH/SPF devices are constructed with a metal alloy resistance wirewound wrapped around a fiberglass core with welded end-caps and sealed with a molded phenolic material. It's also marked with solvent-resistant color bands. The SP20F and SPF devices are fusible versions that feature a flame-resistant coating.

The SPP series resistors are rated for 1W, 2W and 3W at 85C, with resistance values from 0.1? to 2,400? (lower ranges available), in standard tolerances of 5 percent and 10 percent, with TCRs as low as 300ppm/C. They are constructed with a metal alloy resistance wirewound around a fiberglass core with crimped end-caps, conformally-coated and marked with solvent-resistant color bands. The SPP series can also be produced as a fusible resistor by request. Custom specifications are available.

Typical pricing for the SP20/SPH series resistors is 13 cents to 19 cents ach in quantities of 10,000. The SPP series resistors are typically priced at 10 cents each in quantities of 10,000. Delivery is from stock to six weeks.

- Gina Roos
eeProductCenter




Article Comments - Resistors double power ratings
Comments:??
*? You can enter [0] more charecters.
*Verify code:
?
?
Webinars

Seminars

Visit Asia Webinars to learn about the latest in technology and get practical design tips.

?
?
Back to Top